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Livermore
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Altimmune, Inc.

ALT
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001326190

In the last 90 days, Altimmune, Inc. insiders filed 1 open-market purchase and 0 sales; 210 institutions reported holding it in 13F filings for Q2 2026, worth $456.1M in total; Viking Global Investors is the only superinvestor holding it.

Q2 2026 vs. Q1 2026

How the institutions holding Altimmune, Inc. changed between Q1 2026 and Q2 2026.

All holders in Q2 2026All holders in Q1 2026

13F holders of ALT: Q1 2026 compared with Q2 2026
MeasureQ1 2026Of which not filed for Q2 2026Q2 2026Change
Holders1733210+40
Shares69.4M29.0K150.0M+80.7M (+116.4%)
Value$213.5M$89.4K$456.1M+$242.7M (+113.7%)

3 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (58)

Institutions that held Altimmune, Inc. at the end of Q2 2026 but not at the end of Q1 2026.

Institutions new to ALT in Q2 2026
InstitutionSharesValue% of portfolio
Deep Track Capital, LP19,250,000$58.5M0.86%
TCG Crossover Management, LLC10,000,000$30.4M0.73%
Viking Global Investors LPSuperinvestorViking Global Investors6,700,000$20.4M0.06%
Ra Capital Management, L.P.6,500,000$19.8M0.17%
Woodline Partners LP3,400,312$10.3M0.03%
Trails Edge Capital Partners, LP2,660,000$8.09M1.28%
Great Point Partners LLC1,741,232$5.29M1.25%
Weiss Asset Management LP1,530,803$4.65M0.05%
Nantahala Capital Management, LLC1,500,000$4.56M0.28%
Cormorant Asset Management, LP1,250,000$3.80M0.19%
Ghisallo Capital Management LLC750,000$2.28M0.04%
Rock Springs Capital Management LP471,465$1.43M0.07%
LMR Partners LLP300,000$912.0K0.01%
Jump Financial, LLC190,000$577.6K0.01%
Birchview Capital, LP152,681$464.1K0.22%
XTX Topco Ltd128,088$389.4K0.01%
Susquehanna Portfolio Strategies, LLC103,374$314.3K0.01%
ADAR1 Capital Management, LLC102,823$312.6K0.01%
Mariner, LLC101,123$307.4K0.00%
Renaissance Technologies LLC71,600$217.7K0.00%
Ieq Capital, LLC66,954$203.5K0.00%
Envestnet Asset Management Inc56,743$172.5K0.00%
Mercer Global Advisors Inc53,115$161.5K0.00%
Quantbot Technologies LP45,632$138.7K0.01%
Graham Capital Management, L.P.44,940$136.6K0.00%
Cerity Partners LLC35,469$107.8K0.00%
Schonfeld Strategic Advisors LLC35,077$106.6K0.00%
Sequoia Financial Advisors, LLC32,285$98.1K0.00%
Wealth Enhancement Advisory Services, LLC25,989$79.3K0.00%
Two Sigma Securities, LLC25,435$77.3K0.01%
nVerses Capital, LLC24,408$74.2K0.11%
Captrust Financial Advisors23,960$72.8K0.00%
Atria Investments LLC19,017$57.8K0.00%
Jain Global LLC18,947$57.6K0.00%
Neuberger Berman Group LLC18,664$56.7K0.00%
Centiva Capital, LP17,938$54.5K0.00%
Syon Capital LLC17,118$52.0K0.00%
Winton Group Ltd16,100$48.9K0.00%
PKS Advisory Services, LLC15,600$47.4K0.01%
Sciencast Management LP13,566$41.2K0.01%
Aigen Investment Management, LP13,496$41.0K0.01%
R Squared Ltd13,264$40.3K0.02%
Excelsior Advisor Network LLC13,000$39.5K0.01%
Brighton Jones LLC12,596$38.3K0.00%
Colony Group, LLC12,499$38.0K0.00%
Abel Hall, LLC11,527$35.0K0.01%
CIBC Bancorp USA Inc.10,974$33.4K0.00%
Pacer Advisors, Inc.3,759$11.0K0.00%
Clear Street Markets LLC1,507$4.58K0.00%
Federated Hermes, Inc.760$2.31K0.00%
Strategic Wealth Partners, Ltd.700$2.13K0.00%
Wealth Enhancement Trust Services, Inc.306$9300.00%
Parkside Financial Bank & Trust235$7130.00%
RMG Wealth Management LLC225$6590.00%
True Wealth Design, LLC196$5960.00%
Bare Financial Services, Inc196$5960.00%
GAMMA Investing LLC134$4070.00%
Commonwealth Retirement Investments LLC1$30.00%

Sold out (18)

Institutions that held Altimmune, Inc. at the end of Q1 2026 and filed for Q2 2026 without it.

Institutions that sold out of ALT in Q2 2026
InstitutionShares, Q1 2026Value, Q1 2026
Alyeska Investment Group, L.P.2,644,600$8.15M
Schroder Investment Management Group667,837$1.92M
Virtu Financial LLC70,540$217.0K
American Century Companies Inc62,909$193.8K
ExodusPoint Capital Management, LP48,619$149.7K
Farallon Capital Management, L.L.C.27,600$85.0K
Simplex Trading, LLC22,841$70.3K
Scientech Research LLC21,840$67.3K
Keudell/Morrison Wealth Management18,500$57.0K
Nine Masts Capital Ltd11,850$36.5K
Quantinno Capital Management LP10,636$32.8K
IMC-Chicago, LLC10,004$30.8K
Acadian Asset Management LLC7,311$22.0K
Group One Trading, L.P.6,695$20.6K
US Bancorp890$2.74K
Legacy Wealth Managment, LLC250$770
MAI Capital Management150$462
Larson Financial Group LLC5$15

Not filed for Q2 2026 yet (3)

Institutions that held Altimmune, Inc. at the end of Q1 2026 and haven't filed a 13F for Q2 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ALT in Q1 2026 that haven't filed for Q2 2026
InstitutionShares, Q1 2026Value, Q1 2026
Northeast Financial Group, Inc.13,641$42.0K
Sunbelt Securities, Inc.10,870$33.5K
CWM, LLC4,519$13.9K